What Effect Does the Nervous System Have on the Heart

What effect does the nervous system have on the heart rate?

A) Stimulation by parasympathetic nerves causes the heart rate to slow down.
B) Stimulation by sympathetic nerves sets the resting heart rate of the pacemaker cells in the SA node.
C) Stimulation by sympathetic nerves causes the pacemaker cells of the AV node to depolarize more rapidly than the pacemaker cells of the SA node.
D) Stimulation by either the sympathetic or parasympathetic nerves causes pacemaker cells in the SA node to depolarize more slowly.
E) The nervous system does not directly affect the heart rate.